Continuous esterification reaction system, production method of dimethyl adipate and application

Abstract

The invention relates to the technical field of chemical processes, and particularly discloses a continuous esterification reaction system and a production method and application of dimethyl adipate, a continuous methanol separation system comprises a continuous esterification tower and a methanol raw material tank, the methanol raw material tank is used for storing methanol, the end of the esterification tower is communicated with a material tank used for storing pre-esterification liquid, and the material tank is communicated with the esterification tower. The stored pre-esterification liquid can be conveyed into the esterification tower and is subjected to esterification reaction with methanol, the esterification tower is connected with a methanol preheater, and the output end of the methanol preheater is connected with a membrane dryer; according to the invention, unreacted methanol and generated water in the esterification tower are heated and evaporated out through the methanol preheater, and then are filtered and separated through the membrane dryer, so that water is removed, and the residual methanol flows back to the methanol raw material tank and can be continuously conveyed into the esterification tower for esterification reaction; the problems that an existing continuous esterification method for producing dimethyl adipate is high in energy consumption and production cost is increased are solved.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a continuous esterification reaction system, a production method and application of dimethyl adipate. Background technique [0002] Dimethyl adipate, also known as dimethyl adipate, is a colorless and transparent liquid that can be used as a plasticizer and a high-boiling solvent. It is mainly used in the industry to synthesize intermediates, medicines, spices, etc. An important raw material for the production of dimethyl nylon acid and 1,6-hexanediol. [0003] According to literature reports, the current mainstream production method of dimethyl adipate is the continuous esterification method, which mainly includes the following steps: 1) adding methanol and a strong acid resin catalyst into the reactor, and the temperature of the reactor is raised to 75°C Then add solid adipic acid and react under the condition of slightly positive pressure. During the reaction pro...

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Problems solved by technology

[0005] The purpose of the embodiment of the present invention is to provide a kind of continuous esterification reaction system, to solve the existing continuous esterification method for the production of dimethyl adipate proposed in the above-mentioned background technology needs to carry out unreacted methanol vapor during the reaction process Repeated cooling and heating, there is a problem of high energy consumption and increased production costs

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